The ancient Nazca lines, Can only be seen from an altitude.

Just wondering what these lines really used for? May be some alien invasion?
Below are the images made from Nazca lines if you observe them from an altitude.
These are thought to be build around 400-500 BCE by the Nazca civilization and was included in World Heritage Site by UN in 1994. One of the most important fact is that the lines are build near seas.

A giant Bird or a spacecraft guide?

What does this monkey suppose to mean? Why his tail goes round and round? Maybe a helipad?

A giant bird? Enough to eat for a year?

Human with no arms?

There are many of these images you can see if you are over an altitude but you can't be able to see them while standing on ground. Other images include a whale getting killed and a giant spider?

Nobody ever knows why such images was created around 500 BC.

Any idea?

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